A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Squirrels forget where they hide about half of their nuts.
698
Tigers, leopards, and jaguars love "Calvin Klein's Obsession for Men". The scent is used to attract animals to cameras in the wilderness, and was even a turn on for one pair of Jaguars who were subject to it.
17
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6